Extremophiles最新文献_第2页

RNase R vs. PNPase: selecting the best-suited exoribonuclease for environmental adaptation. RNase R 与 PNPase：选择最适合环境适应的外切核酸酶。

IF 2.6 3区生物学

Extremophiles Pub Date : 2024-07-25 DOI: 10.1007/s00792-024-01350-6

Theetha L Pavankumar

引用次数: 0

Effects of temperature, chloride and perchlorate salt concentration on the metabolic activity of Deinococcus radiodurans. 温度、氯化物和高氯酸盐浓度对放射球菌代谢活动的影响。

IF 2.6 3区生物学

Extremophiles Pub Date : 2024-07-24 DOI: 10.1007/s00792-024-01351-5

Eftychia Symeonidou, Uffe Gråe Jørgensen, Morten Bo Madsen, Anders Priemé

{"title":"Effects of temperature, chloride and perchlorate salt concentration on the metabolic activity of Deinococcus radiodurans.","authors":"Eftychia Symeonidou, Uffe Gråe Jørgensen, Morten Bo Madsen, Anders Priemé","doi":"10.1007/s00792-024-01351-5","DOIUrl":"10.1007/s00792-024-01351-5","url":null,"abstract":"The extremophile bacterium Deinococcus radiodurans is characterized by its ability to survive and sustain its activity at high levels of radiation and is considered an organism that might survive in extraterrestrial environments. In the present work, we studied the combined effects of temperature and chlorine-containing salts, with focus on perchlorate salts which have been detected at high concentrations in Martian regolith, on D. radiodurans activity (CO2 production rates) and viability after incubation in liquid cultures for up to 30 days. Reduced CO2 production capacity and viability was observed at high perchlorate concentrations (up to 10% w/v) during incubation at 0 or 25 °C. Both the metabolic activity and viability were reduced as the perchlorate and chloride salt concentration increased and temperature decreased, and an interactive effect of temperature and salt concentration on the metabolic activity was found. These results indicate the ability of D. radiodurans to remain metabolically active and survive in low temperature environments rich in perchlorate.","PeriodicalId":12302,"journal":{"name":"Extremophiles","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11266278/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141751442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of carotenoids extracted from Haloferax larsenii NCIM 5678 isolated from Pachpadra salt lake, Rajasthan. 从拉贾斯坦邦 Pachpadra 盐湖分离的 Haloferax larsenii NCIM 5678 中提取的类胡萝卜素的特征。

IF 2.6 3区生物学

Extremophiles Pub Date : 2024-07-22 DOI: 10.1007/s00792-024-01353-3

Pardeep Sheokand, Santosh Kumar Tiwari

{"title":"Characterization of carotenoids extracted from Haloferax larsenii NCIM 5678 isolated from Pachpadra salt lake, Rajasthan.","authors":"Pardeep Sheokand, Santosh Kumar Tiwari","doi":"10.1007/s00792-024-01353-3","DOIUrl":"https://doi.org/10.1007/s00792-024-01353-3","url":null,"abstract":"Carotenoids are a diverse group of pigments known for their broad range of biological functions and applications. This study delves into multifaceted potential of carotenoids extracted from Haloferax larsenii NCIM 5678 previously isolated from Pachpadra Salt Lake in Rajasthan, India. H. larsenii NCIM 5678 was able to grow up to OD600 1.77 ± 0.03 with carotenoid concentration, 3.3 ± 0.03 µg/ml. The spectrophotometric analysis of carotenoid extract indicated the presence of three-fingered peak (460, 490 and 520 nm) which is a characteristic feature of bacterioruberin and its derivatives. The bacterioruberin was purified using silica gel column chromatography and thin layer chromatography. The carotenoid extract showed 12.3 ± 0.09 mm zone of growth inhibition with a minimum inhibitory concentration 546 ng/ml against indicator strain, H. larsenii HA4. The percentage antioxidant activity of carotenoid was found to be 84% which was higher as compared to commercially available ascorbic acid (56.74%). Thus, carotenoid extract from H. larsenii NCIM 5678 possesses unique attributes with compelling evidence of antimicrobial and antioxidant potential for the development of novel pharmaceuticals and nutraceuticals.","PeriodicalId":12302,"journal":{"name":"Extremophiles","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141733917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bioenergetic characterization of hyperthermophilic archaean Methanocaldococcus sp. FS406-22. 超嗜热古菌 Methanocaldococcus sp. FS406-22 的生物能特征。

IF 2.6 3区生物学

Extremophiles Pub Date : 2024-07-18 DOI: 10.1007/s00792-024-01349-z

Addien C Wray, Autum R Downey, Andrea A Nodal, Katherine K Park, Drew Gorman-Lewis

{"title":"Bioenergetic characterization of hyperthermophilic archaean Methanocaldococcus sp. FS406-22.","authors":"Addien C Wray, Autum R Downey, Andrea A Nodal, Katherine K Park, Drew Gorman-Lewis","doi":"10.1007/s00792-024-01349-z","DOIUrl":"https://doi.org/10.1007/s00792-024-01349-z","url":null,"abstract":"Hyperthermophilic archaean Methanocaldococcus sp. FS406-22 (hereafter FS406) is a hydrogenotrophic methanogen isolated from a deep-sea hydrothermal vent. To better understand the energetic requirements of hydrogen oxidation under extreme conditions, the thermodynamic characterization of FS406 incubations is necessary and notably underexplored. In this work, we quantified the bioenergetics of FS406 incubations at a range of temperatures (65, 76, and 85 ℃) and hydrogen concentrations (1.1, 1.4, and 2.1 mm). The biomass yields (C-mol of biomass per mol of H2 consumed) ranged from 0.02 to 0.19. Growth rates ranged from 0.4 to 1.5 h-1. Gibbs energies of incubation based on macrochemical equations of cell growth ranged from <math><mrow><mo>-</mo> <mn>198</mn></mrow> </math> kJ/C-mol to <math><mrow><mo>-</mo> <mn>1840</mn></mrow> </math> kJ/C-mol. Enthalpies of incubation determined from calorimetric measurements ranged from <math><mrow><mo>-</mo> <mn>4150</mn></mrow> </math> kJ/C-mol to <math><mrow><mo>-</mo> <mn>36333</mn></mrow> </math> kJ/C-mol. FS406 growth rates were most comparable to hyperthermophilic methanogen Methanocaldococcus jannaschii. Maintenance energy calculations from the thermodynamic parameters of FS406 and previously determined heterotrophic methanogen data revealed that temperature is a primary determinant rather than an electron donor. This work provides new insights into the thermodynamic underpinnings of a hyperthermophilic hydrothermal vent methanogen and helps to better constrain the energetic requirements of life in extreme environments.","PeriodicalId":12302,"journal":{"name":"Extremophiles","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141633112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Untangling the adaptive strategies of thermophilic bacterium Anoxybacillus rupiensis TPH1 under low temperature. 解开嗜热细菌 Anoxybacillus rupiensis TPH1 在低温下的适应策略。

IF 2.6 3区生物学

Extremophiles Pub Date : 2024-07-17 DOI: 10.1007/s00792-024-01346-2

Aditi Mishra, Sindhunath Chakraborty, Tameshwar Prasad Jaiswal, Samujjal Bhattacharjee, Shreya Kesarwani, Arun Kumar Mishra, Satya Shila Singh

{"title":"Untangling the adaptive strategies of thermophilic bacterium Anoxybacillus rupiensis TPH1 under low temperature.","authors":"Aditi Mishra, Sindhunath Chakraborty, Tameshwar Prasad Jaiswal, Samujjal Bhattacharjee, Shreya Kesarwani, Arun Kumar Mishra, Satya Shila Singh","doi":"10.1007/s00792-024-01346-2","DOIUrl":"10.1007/s00792-024-01346-2","url":null,"abstract":"The present study investigates the low temperature tolerance strategies of thermophilic bacterium Anoxybacillus rupiensis TPH1, which grows optimally at 55 °C , by subjecting it to a temperature down-shift of 10 °C (45 °C) for 4 and 6 h followed by studying its growth, morphophysiological, molecular and proteomic responses. Results suggested that although TPH1 experienced increased growth inhibition, ROS production, protein oxidation and membrane disruption after 4 h of incubation at 45 °C yet maintained its DNA integrity and cellular structure through the increased expression of DNA damage repair and cell envelop synthesizing proteins and also progressively alleviated growth inhibition by 20% within two hours i.e., 6 h, by inducing the expression of antioxidative enzymes, production of unsaturated fatty acids, capsular and released exopolysaccharides and forming biofilm along with chemotaxis proteins. Conclusively, the adaptation of Anoxybacillus rupiensis TPH1 to lower temperature is mainly mediated by the synthesis of large numbers of defense proteins and exopolysaccharide rich biofilm formation.","PeriodicalId":12302,"journal":{"name":"Extremophiles","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141633113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enzymes and biosurfactants of industrial interest produced by culturable fungi present in sediments of Boeckella Lake, Hope Bay, north-east Antarctic Peninsula. 南极半岛东北部希望湾 Boeckella 湖沉积物中可培养真菌产生的具有工业价值的酶和生物表面活性剂。

IF 2.6 3区生物学

Extremophiles Pub Date : 2024-06-22 DOI: 10.1007/s00792-024-01345-3

Elisa Amorim Amâncio Teixeira, Láuren Machado Drumond de Souza, Rosemary Vieira, Juan Manuel Lirio, Silvia Herminda Coria, Peter Convey, Carlos Augusto Rosa, Luiz Henrique Rosa

{"title":"Enzymes and biosurfactants of industrial interest produced by culturable fungi present in sediments of Boeckella Lake, Hope Bay, north-east Antarctic Peninsula.","authors":"Elisa Amorim Amâncio Teixeira, Láuren Machado Drumond de Souza, Rosemary Vieira, Juan Manuel Lirio, Silvia Herminda Coria, Peter Convey, Carlos Augusto Rosa, Luiz Henrique Rosa","doi":"10.1007/s00792-024-01345-3","DOIUrl":"10.1007/s00792-024-01345-3","url":null,"abstract":"This study characterized cultivable fungi present in sediments obtained from Boeckella Lake, Hope Bay, in the north-east of the Antarctic Peninsula, and evaluated their production of enzymes and biosurfactants of potential industrial interest. A total of 116 fungal isolates were obtained, which were classified into 16 genera within the phyla Ascomycota, Basidiomycota and Mortierellomycota, in rank. The most abundant genera of filamentous fungi included Pseudogymnoascus, Pseudeurotium and Antarctomyces; for yeasts, Thelebolales and Naganishia taxa were dominant. Overall, the lake sediments exhibited high fungal diversity and moderate richness and dominance. The enzymes esterase, cellulase and protease were the most abundantly produced by these fungi. Ramgea cf. ozimecii, Holtermanniella wattica, Leucosporidium creatinivorum, Leucosporidium sp., Mrakia blollopis, Naganishia sp. and Phenoliferia sp. displayed enzymatic index > 2. Fourteen isolates of filamentous fungi demonstrated an Emulsification Index 24% (EI24%) ≥ 50%; among them, three isolates of A. psychrotrophicus showed an EI24% > 80%. Boeckella Lake itself is in the process of drying out due to the impact of regional climate change, and may be lost completely in approaching decades, therefore hosts a threatened community of cultivable fungi that produce important biomolecules with potential application in biotechnological processes.","PeriodicalId":12302,"journal":{"name":"Extremophiles","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141440386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mineralogical and microbial characterization of alkali hot spring microbial mats and deposits in Pong Dueat Pa Pae hot spring, Northern Thailand. 泰国北部 Pong Dueat Pa Pae 温泉碱性温泉微生物垫和沉积物的矿物学和微生物特征。

IF 2.6 3区生物学

Extremophiles Pub Date : 2024-06-20 DOI: 10.1007/s00792-024-01343-5

C Sriaporn, S Komonjinda, S Awiphan, S Santitharangkun, C Banjongprasert, M Osathanunkul, B Ramsiri

{"title":"Mineralogical and microbial characterization of alkali hot spring microbial mats and deposits in Pong Dueat Pa Pae hot spring, Northern Thailand.","authors":"C Sriaporn, S Komonjinda, S Awiphan, S Santitharangkun, C Banjongprasert, M Osathanunkul, B Ramsiri","doi":"10.1007/s00792-024-01343-5","DOIUrl":"10.1007/s00792-024-01343-5","url":null,"abstract":"Hot spring environments encompass broad physicochemical ranges, in which temperature and pH account for crucial factors shaping hot spring microbial community and diversity. However, the presence of photosynthetic microbial mats adjacent to boiling hot spring vents, where fluid temperatures extend beyond photosynthetic capability, questions the microbial profiles and the actual temperatures of such adjacent mats. Therefore, this study aims to characterize thermophilic microbial communities at Pong Dueat Pa Pae hot spring using next-generation sequencing, including investigating hot spring mineralogy. Results suggest that Pong Dueat Pa Pae hot spring precipitates comprise mainly silica which also acts as the main preservative medium for microbial permineralization. Molecular results revealed the presence of cyanobacterial and Chloroflexi species in the thick, orange and green subaerial mats surrounding the vents, suggesting the mats would be at least 30 °C cooler than source vents despite constantly receiving geyser splashes. Bacterial abundance was considerably higher than archaeal (97.9% versus 2.1%). Cyanobacterial (mainly Synechococcus and Leptolygbya) and Chloroflexi species (mainly Roseiflexus) accounted for almost half (40.04%) of the bacterial community, while DHVEG-6 and Thaumarchaeota comprised dominant members (> 90%) of the archaeal fraction. This study updates and provides insights into thermophilic microbial community composition and mineralogy of hot springs in Thailand.","PeriodicalId":12302,"journal":{"name":"Extremophiles","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141426630","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Halobacterium yunchengense sp. nov., Natronomonas amylolytica sp. nov., Halorientalis halophila sp. nov., Halobellus salinisoli sp. nov., halophilic archaea isolated from a saline lake and inland saline soil. 从盐湖和内陆盐碱土壤中分离出的嗜卤古细菌--运城卤杆菌新种（Halobacterium yunchengense sp.nov.）、淀粉单胞菌新种（Natronomonas amylolytica sp.nov.）、卤代卤虫新种（Halorientalis halophila sp.nov.）和盐渍卤虫新种（Halobellus salinisoli sp.nov.）。

IF 2.6 3区生物学

Extremophiles Pub Date : 2024-06-18 DOI: 10.1007/s00792-024-01347-1

Ling Cui, Yao Hu, Xin-Xin Li, Xue Ma, Mu Cheng, Shun Tan, Jing Hou, Heng-Lin Cui

{"title":"Halobacterium yunchengense sp. nov., Natronomonas amylolytica sp. nov., Halorientalis halophila sp. nov., Halobellus salinisoli sp. nov., halophilic archaea isolated from a saline lake and inland saline soil.","authors":"Ling Cui, Yao Hu, Xin-Xin Li, Xue Ma, Mu Cheng, Shun Tan, Jing Hou, Heng-Lin Cui","doi":"10.1007/s00792-024-01347-1","DOIUrl":"10.1007/s00792-024-01347-1","url":null,"abstract":"Four halophilic archaeal strains YCN1T, YCN58T, LT38T, and LT62T were isolated from Yuncheng Salt Lake (Shanxi, China) and Tarim Basin (Xinjiang, China), respectively. Phylogenetic and phylogenomic analyses showed that these four strains tightly cluster with related species of Halobacterium, Natronomonas, Halorientalis, and Halobellus, respectively. The AAI, ANI, and dDDH values between these four strains and their related species of respective genera were lower than the proposed threshold values for species delineation. Strains YCN1T, YCN58T, LT38T, and LT62T could be differentiated from the current species of Halobacterium, Natronomonas, Halorientalis, and Halobellus, respectively, based on the comparison of diverse phenotypic characteristics. The polar lipid profiles of these four strains were closely similar to those of respective relatives within the genera Halobacterium, Natronomonas, Halorientalis, and Halobellus, respectively. The phenotypic, phylogenetic, and genome-based analyses indicated that strains YCN1T, YCN58T, LT38T, and LT62T represent respective novel species within the genera Halobacterium, Natronomonas, Halorentalis, and Halobellus, for which the names Halobacterium yunchengense sp. nov., Natronomonas amylolytica sp. nov., Halorientalis halophila sp. nov., and Halobellus salinisoli sp. nov. are proposed, respectively.","PeriodicalId":12302,"journal":{"name":"Extremophiles","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141418553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization and biological activities of a novel exopolysaccharide produced from Geobacillus thermodenitrificans HBB 111 strain. 热核硝化地杆菌 HBB 111 菌株产生的新型外多糖的特性和生物活性。

IF 2.6 3区生物学

Extremophiles Pub Date : 2024-06-11 DOI: 10.1007/s00792-024-01344-4

Mehmet Aytar, Gamze Başbülbül, Deniz Aktaş Uygun

引用次数: 0

Extremophiles in a changing world 变化世界中的嗜极生物

IF 2.9 3区生物学

Extremophiles Pub Date : 2024-04-29 DOI: 10.1007/s00792-024-01341-7

D. A. Cowan, S. V. Albers, G. Antranikian, H. Atomi, B. Averhoff, M. Basen, A. J. M. Driessen, M. Jebbar, Z. Kelman, M. Kerou, J. Littlechild, V. Müller, P. Schönheit, B. Siebers, K. Vorgias

{"title":"Extremophiles in a changing world","authors":"D. A. Cowan, S. V. Albers, G. Antranikian, H. Atomi, B. Averhoff, M. Basen, A. J. M. Driessen, M. Jebbar, Z. Kelman, M. Kerou, J. Littlechild, V. Müller, P. Schönheit, B. Siebers, K. Vorgias","doi":"10.1007/s00792-024-01341-7","DOIUrl":"https://doi.org/10.1007/s00792-024-01341-7","url":null,"abstract":"Extremophiles and their products have been a major focus of research interest for over 40 years. Through this period, studies of these organisms have contributed hugely to many aspects of the fundamental and applied sciences, and to wider and more philosophical issues such as the origins of life and astrobiology. Our understanding of the cellular adaptations to extreme conditions (such as acid, temperature, pressure and more), of the mechanisms underpinning the stability of macromolecules, and of the subtleties, complexities and limits of fundamental biochemical processes has been informed by research on extremophiles. Extremophiles have also contributed numerous products and processes to the many fields of biotechnology, from diagnostics to bioremediation. Yet, after 40 years of dedicated research, there remains much to be discovered in this field. Fortunately, extremophiles remain an active and vibrant area of research. In the third decade of the twenty-first century, with decreasing global resources and a steadily increasing human population, the world’s attention has turned with increasing urgency to issues of sustainability. These global concerns were encapsulated and formalized by the United Nations with the adoption of the 2030 Agenda for Sustainable Development and the presentation of the seventeen Sustainable Development Goals (SDGs) in 2015. In the run-up to 2030, we consider the contributions that extremophiles have made, and will in the future make, to the SDGs.","PeriodicalId":12302,"journal":{"name":"Extremophiles","volume":null,"pages":null},"PeriodicalIF":2.9,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140840958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0